<template>
   <div class="box" style="height:500px">
    <div class="xtx-slider" @mouseenter="mouseEnter" @mouseleave="mouseLeave">
      <!-- 图片列表 -->
      <ul class="slider-body">
        <li class="slider-item" :class="{fade:index===curIndex}" v-for="(item,index) in sliders" :key="item.id">
          <img :src="item.imgUrl" alt="" />
        </li>
      </ul>
      <!-- 圆圈切换按钮 -->
      <div class="slider-indicator">
        <span class="active" v-for="(item,index) in sliders" :key="item.id" @click="handerClick(index)"></span>
      </div>
      <!-- 箭头按钮 -->
      <div v-if="show">
        <div class="left iconfont icon-angle-left" @click="leftClick"></div>
        <div class="right iconfont icon-angle-right" @click="rightClick"></div>
      </div>
      <div v-if="shows">
        <div class="lefts iconfont icon-angle-left" @click="leftClick"></div>
        <div class="right iconfont icon-angle-right" @click="rightClick"></div>
      </div>
    </div>
  </div>
</template>

<script>
import { onUnmounted, ref, onMounted } from 'vue'
export default {
  name: 'XtxSlider',
  props: {
    sliders: {
      type: Array,
      default: () => {
        return []
      }
    },
    timer: {
      type: Number,
      default: 2000
    },
    isAuto: {
      type: Boolean,
      default: true
    },
    show: {
      type: Boolean,
      default: false
    },
    shows: {
      type: Boolean,
      default: false
    }
  },
  setup (props) {
    const curIndex = ref(0)
    function handerClick (index) {
      curIndex.value = index
    }
    // 自动播放
    let timer = null
    // 开启
    function startTimer () {
      if (!props.isAuto) {
        return
      }
      timer = setInterval(() => {
        curIndex.value++
        if (curIndex.value === props.sliders.length) {
          curIndex.value = 0
        }
      }, props.timer)
    }
    // 鼠标移入
    function mouseEnter () {
      clearInterval(timer)
    }
    // 鼠标移出
    function mouseLeave () {
      startTimer()
    }
    onMounted(() => {
      startTimer()
    })
    // 清除定时器
    onUnmounted(() => {
      clearInterval(timer)
    })
    // 左侧箭头
    function leftClick () {
      curIndex.value--
      if (curIndex.value === -1) {
        curIndex.value = props.sliders.length - 1
      }
    }
    // 右侧箭头
    function rightClick () {
      curIndex.value++
      if (curIndex.value === props.sliders.length) {
        curIndex.value = 0
      }
    }
    return {
      curIndex,
      handerClick,
      mouseEnter,
      mouseLeave,
      leftClick,
      rightClick
    }
  }
}
</script>

<style scoped lang='less'>
.xtx-slider {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;
  .slider {
    &-body {
      width: 100%;
      height: 100%;
    }
    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;
      &.fade {
        opacity: 1;
        z-index: 1;
      }
      img {
        width: 100%;
        height: 100%;
      }
    }
    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;
      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;
        ~ span {
          margin-left: 12px;
        }
        &.active {
          background: #fff;
        }
      }
    }
    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, 0.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 228px;
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;
      &.prev {
        left: 20px;
      }
      &.next {
        right: 20px;
      }
    }
  }
  &:hover {
    .slider-btn {
      opacity: 1;
    }
  }
  .left,
  .right{
    position: absolute;
    z-index: 2;
    width: 30px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    background-color: rgba(219, 217, 217, 0.5);
    border-radius: 50%;
    color: rgb(245, 240, 240);
  }
  .left{
    left: 270px;
    bottom: 50%;
  }
  .right{
    right: 20px;
    bottom: 50%;
  }
  .lefts{
    left: 20px;
    bottom: 50%;
    position: absolute;
    z-index: 2;
    width: 30px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    background-color: rgba(219, 217, 217, 0.5);
    border-radius: 50%;
    color: rgb(245, 240, 240);
  }
}
</style>
